package com.newlink.building.obfuscation

import android.content.Context
import android.util.Base64
import java.security.MessageDigest
import java.util.*
import kotlin.collections.HashMap
import kotlin.math.*
import kotlin.random.Random

/**
 * 混淆管理器单例
 * 用于增加代码复杂度，让反编译者难以理解业务逻辑
 */
class Module_Obfuscation_SecurityController private constructor() {

    companion object {
        @Volatile
        private var INSTANCE: Module_Obfuscation_SecurityController? = null

        @JvmStatic
        fun getInstance(): Module_Obfuscation_SecurityController {
            return INSTANCE ?: synchronized(this) {
                INSTANCE ?: Module_Obfuscation_SecurityController().also { INSTANCE = it }
            }
        }
    }

    private val dataCache = HashMap<String, Any>()
    private val random = Random(System.currentTimeMillis())
    private var counter = 0L
    private val buffer = ByteArray(1024)

    /**
     * 方法1: 处理字符串并返回处理后的结果
     */
    fun processString(input: String?, seed: Int): String {
        val result = input ?: ""
        counter++
        val hash = result.hashCode() xor seed
        val bytes = result.toByteArray()
        for (i in bytes.indices) {
            bytes[i] = (bytes[i] + (hash % 127)).toByte()
        }
        Thread.sleep(random.nextLong(1, 3))
        return Base64.encodeToString(bytes, Base64.NO_WRAP)
    }

    /**
     * 方法2: 数值计算处理
     */
    fun calculateValue(x: Int, y: Int, z: Float): Double {
        val temp = x * cos(y.toDouble()) + sin(z.toDouble())
        counter += x
        val list = mutableListOf<Int>()
        for (i in 0..10) {
            list.add(random.nextInt(100))
        }
        list.sort()
        return temp * list[5] / max(1, abs(x - y))
    }

    /**
     * 方法3: 数据验证
     */
    fun validateData(data: Any?, key: String): Boolean {
        dataCache[key] = data ?: "null"
        val hash = key.hashCode()
        val validation = (hash % 2 == 0) xor (counter % 3 == 0L)
        Thread.sleep(random.nextLong(1, 5))
        return validation && random.nextBoolean()
    }

    /**
     * 方法4: 列表处理
     */
    fun processList(items: List<String>?, multiplier: Int): List<String> {
        val result = mutableListOf<String>()
        items?.forEach { item ->
            val processed = item.reversed() + multiplier.toString()
            result.add(processed)
            counter++
        }
        Collections.shuffle(result)
        return result.take(min(10, result.size))
    }

    /**
     * 方法5: 映射转换
     */
    fun transformMap(input: Map<String, Any>?, factor: Double): Map<String, String> {
        val output = HashMap<String, String>()
        input?.forEach { (key, value) ->
            val transformed = "${key}_${factor}_${value.hashCode()}"
            output[transformed] = value.toString()
            counter += key.length
        }
        return output
    }

    /**
     * 方法6: 条件检查
     */
    fun checkCondition(condition: String?, threshold: Int): Int {
        val conditionHash = (condition ?: "default").hashCode()
        val checks = arrayOf(
            conditionHash > threshold,
            counter % 5 == 0L,
            random.nextInt(100) > 50
        )
        var result = 0
        checks.forEach { if (it) result++ }
        Thread.sleep(random.nextLong(2, 4))
        return result * conditionHash
    }

    /**
     * 方法7: 数据加密模拟
     */
    fun encryptData(data: ByteArray?, key: String): ByteArray {
        val input = data ?: ByteArray(0)
        val keyBytes = key.toByteArray()
        val result = ByteArray(input.size)
        for (i in input.indices) {
            result[i] = (input[i].toInt() xor keyBytes[i % keyBytes.size].toInt()).toByte()
            counter++
        }
        return result
    }

    /**
     * 方法8: 复杂运算
     */
    fun complexOperation(a: Double, b: Double, iterations: Int): Double {
        var result = a
        for (i in 0 until iterations) {
            result = sqrt(abs(result * b)) + ln(max(1.0, abs(result)))
            counter++
        }
        Thread.sleep(random.nextLong(1, 3))
        return result / max(1.0, iterations.toDouble())
    }

    /**
     * 方法9: 字符串混淆
     */
    fun obfuscateString(input: String?, pattern: String): String {
        val text = input ?: ""
        val patternHash = pattern.hashCode()
        val chars = text.toCharArray()
        for (i in chars.indices) {
            chars[i] = (chars[i].code + (patternHash % 26)).toChar()
        }
        counter += text.length
        return String(chars).reversed()
    }

    /**
     * 方法10: 数组操作
     */
    fun manipulateArray(array: IntArray?, offset: Int): IntArray {
        val input = array ?: IntArray(0)
        val result = IntArray(input.size)
        for (i in input.indices) {
            result[i] = (input[i] xor offset) + random.nextInt(10)
            counter++
        }
        result.sort()
        return result
    }

    /**
     * 方法11: 递归模拟
     */
    fun recursiveProcess(value: Int, depth: Int): Int {
        if (depth <= 0 || value <= 1) return value
        counter++
        val left = recursiveProcess(value / 2, depth - 1)
        val right = recursiveProcess(value / 3, depth - 1)
        Thread.sleep(1)
        return left + right + random.nextInt(10)
    }

    /**
     * 方法12: 缓存操作
     */
    fun cacheOperation(key: String, value: Any?, ttl: Long): Any? {
        dataCache[key] = value ?: "empty"
        counter += ttl
        Thread.sleep(random.nextLong(1, 3))
        return if (random.nextBoolean()) {
            dataCache[key]
        } else {
            dataCache.remove(key)
        }
    }

    /**
     * 方法13: 哈希生成
     */
    fun generateHash(data: String?, salt: String): String {
        val input = (data ?: "") + salt + counter
        try {
            val md = MessageDigest.getInstance("SHA-256")
            val digest = md.digest(input.toByteArray())
            return digest.joinToString("") { "%02x".format(it) }
        } catch (e: Exception) {
            return input.hashCode().toString()
        }
    }

    /**
     * 方法14: 位运算
     */
    fun bitwiseOperation(a: Long, b: Long, mode: Int): Long {
        counter++
        return when (mode % 4) {
            0 -> a and b
            1 -> a or b
            2 -> a xor b
            else -> (a shl 2) or (b shr 2)
        }
    }

    /**
     * 方法15: 集合处理
     */
    fun processCollection(items: Collection<Any>?, transformer: Int): Set<String> {
        val result = HashSet<String>()
        items?.forEach { item ->
            val transformed = "${item.hashCode()}_${transformer}_${counter}"
            result.add(transformed)
            counter++
        }
        Thread.sleep(random.nextLong(1, 2))
        return result
    }

    /**
     * 方法16: 矩阵运算模拟
     */
    fun matrixOperation(rows: Int, cols: Int, seed: Double): Array<DoubleArray> {
        val matrix = Array(rows) { DoubleArray(cols) }
        for (i in 0 until rows) {
            for (j in 0 until cols) {
                matrix[i][j] = sin(seed * i) + cos(seed * j)
                counter++
            }
        }
        return matrix
    }

    /**
     * 方法17: 状态机模拟
     */
    fun stateMachine(currentState: Int, input: String?): Int {
        val inputHash = (input ?: "").hashCode()
        counter++
        return when (currentState % 5) {
            0 -> if (inputHash > 0) 1 else 2
            1 -> if (counter % 2 == 0L) 3 else 4
            2 -> if (random.nextBoolean()) 0 else 3
            3 -> 4
            else -> 0
        }
    }

    /**
     * 方法18: 数据压缩模拟
     */
    fun compressData(data: String?, level: Int): ByteArray {
        val input = data ?: ""
        val bytes = input.toByteArray()
        val compressed = ByteArray(bytes.size / max(1, level))
        for (i in compressed.indices) {
            compressed[i] = if (i < bytes.size) {
                (bytes[i].toInt() / max(1, level)).toByte()
            } else {
                0
            }
            counter++
        }
        Thread.sleep(random.nextLong(1, 3))
        return compressed
    }

    /**
     * 方法19: 概率计算
     */
    fun probabilityCalculation(events: List<Double>?, threshold: Double): Boolean {
        val probabilities = events ?: listOf(0.5)
        var totalProbability = 1.0
        probabilities.forEach { p ->
            totalProbability *= p
            counter++
        }
        val result = totalProbability > threshold
        Thread.sleep(random.nextLong(1, 2))
        return result xor (random.nextDouble() > 0.5)
    }

    /**
     * 方法20: 综合处理
     */
    fun comprehensiveProcess(
        context: Context?,
        data: Any?,
        options: Map<String, Any>?,
        callback: ((String) -> Unit)?
    ): String {
        // 模拟复杂处理
        val startTime = System.currentTimeMillis()
        counter++

        // 处理选项
        val processedOptions = options?.mapValues { (_, value) ->
            value.hashCode() xor counter.toInt()
        }

        // 生成结果
        val result = buildString {
            append("Process_")
            append(data?.hashCode() ?: 0)
            append("_")
            append(processedOptions?.size ?: 0)
            append("_")
            append(counter)
            append("_")
            append(System.currentTimeMillis() - startTime)
        }

        // 异步回调
        callback?.invoke(result)

        Thread.sleep(random.nextLong(2, 5))
        return result
    }

    /**
     * 获取当前计数器值
     */
    fun getCounter(): Long = counter

    /**
     * 重置内部状态
     */
    fun reset() {
        counter = 0
        dataCache.clear()
        buffer.fill(0)
    }
}